You want to confirm that the dynamic linker's cache already knows about libssl.so.3, without running or even having a program that uses it. Which command lists the cache contents?
LPIC-1 Exam 101-500, objective 102. Linux installation and package management easy
Machine-checked — no person has signed for it. This question was read against the source cited below by an automated pass, which found no contradiction. That is a weaker claim than it sounds: the same kind of process wrote the question, so it can confirm its own mistake.
Treat it as a good draft rather than as settled fact, and read the source below before you rely on it. It is not used in mock exams here — only questions a person has signed for are.
How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
The options
Correct ldconfig -p
Correct. -p prints the libraries currently listed in /etc/ld.so.cache together with the paths they resolve to, so it can be piped to grep.
Not correct ldd libssl.so.3
Wrong for this purpose. ldd reports what a given file itself depends on; it needs a real path to a binary or library and says nothing about the cache.
Not correct ldconfig -v
Wrong. -v rebuilds the cache while printing what it scans, so it modifies the system rather than only reporting on it.
Not correct cat /etc/ld.so.conf
Wrong. That file lists the directories to be searched, not the libraries found in them, and on most distributions it does little more than include /etc/ld.so.conf.d/*.conf.
Why
ldconfig has two modes: run with no options it rescans the configured directories and rewrites /etc/ld.so.cache, and with -p it only prints what the cache already contains. The distinction to carry is configuration versus cache: /etc/ld.so.conf and its .conf drop-ins say where to look, the cache is the compiled result, and ld.so reads only the cache at program start-up.
Where this comes from
- Cited
- manual page ldconfig(8)
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 102 and space the ones you get wrong.
More questions on this objective
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